Reference for Bava Kamma 194:6

הכא במאי עסקינן כשמלכיות מקפידות זו על זו אי הכי של בבל והן בבבל למאי חזו חזו דזבין בהו בהמה ומסיק לירושלים

Come and hear: Redemption [of the second tithe] cannot be effected by means of coins which have currency here<span class="x" onmousemove="('comment',' In Jerusalem. ');">¹⁰</span> but which are actually [with the owner] in Babylon;<span class="x" onmousemove="('comment',' Where they have no currency. ');">¹¹</span>

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